"SO" stands for significant other.

One more point I should mention about all this: if diabetes or impaired glucose tolerance is being contemplated as a possible cause, a three to five hour glucose tolerance test with concurrent insulin levels should be considered, as merely taking a blood glucose level, or even a HemoglobinA1c, does not catch all "pre-diabetic" glucose intolerant people--or even all diabetics, unless their blood sugars are grossly deviant at all times (not something that all people with these issues experience; some only show abnormal responses to glucose challenge). It is the pattern of responses to glucose challenge over time that is often more indicative of whether a person has a degree of glucose dysregulation--and this is important, as there is increasing evidence that neuropathy can set in well before frank diabetes could be diagnosed under present guidelines (and this is not something even most endocrinologists are taught in med school; most are taught neuropathy is a long-term complication that shows up well into the condition).

See:

http://intl.neurology.org/cgi/content/abstract/60/1/108

http://www3.interscience.wiley.com/c...TRY=1&SRETRY=0

http://www.ncbi.nlm.nih.gov/entrez/q..._uids=16448668

http://www3.interscience.wiley.com/c...07929/ABSTRACT

http://www.ncbi.nlm.nih.gov/entrez/q...d_AbstractPlus

There are a lot more, but you get the idea.